| In millions, except per share items | Dec-31-22 | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-31-17 | Dec-31-16 | Dec-31-15 |
| | 8-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| INTEREST INCOME: | | | | | | | | |
| Loans, including fees | | 217.4 | 241.0 | 260.1 | 237.6 | 205.6 | 164.2 | 134.0 |
| Taxable investment securities | | 7.5 | 9.8 | 13.5 | 11.8 | 9.4 | 7.9 | 7.0 |
| Federal Home Loan Bank stock and other | | 1.4 | 1.4 | 7.3 | 6.7 | 3.8 | 1.9 | 1.4 |
| Total interest income | 244.2 | 226.3 | 252.3 | 280.9 | 256.2 | 218.8 | 174.0 | 142.4 |
| |
| INTEREST EXPENSE: | | | | | | | | |
| Deposits | | 5.0 | 15.1 | 29.1 | 17.0 | 9.8 | 6.1 | 4.4 |
| Securities sold under agreements to repurchase and other short-term borrowings | | 0.1 | 0.2 | 1.2 | 1.1 | 0.5 | 0.1 | 0.1 |
| Federal Home Loan Bank advances | | 0.1 | 3.5 | 12.8 | 10.5 | 8.9 | 10.9 | 11.9 |
| Total interest expense | 7.5 | 5.7 | 19.9 | 44.8 | 30.1 | 20.3 | 17.9 | 18.5 |
| NET INTEREST INCOME | 236.7 | 220.6 | 232.3 | 236.1 | 226.1 | 198.5 | 156.1 | 124.0 |
| Provision for expected credit loss expense for on-balance sheet exposures | | 14.8 | 31.3 | 25.8 | 31.4 | 27.7 | 14.5 | 5.4 |
| NET INTEREST INCOME AFTER PROVISION | | 205.8 | 201.0 | 210.4 | 194.7 | 170.8 | 141.6 | 118.6 |
| |
| NONINTEREST INCOME: | | | | | | | | |
| Mortgage banking income | | 20.0 | 31.8 | 9.5 | 4.8 | 4.6 | 6.9 | 1.9 |
| Program fees | 16.2 | 14.5 | 7.1 | 4.7 | 6.2 | 5.8 | 3.0 | 1.2 |
| Increase in cash surrender value of bank owned life insurance | | 2.2 | 1.6 | 1.6 | 1.5 | 1.6 | 1.5 | 1.4 |
| |
| Revenue under 606 | | | | | | | | |
| Total noninterest income | 13.4 | 86.9 | 87.1 | 75.0 | 63.4 | 58.4 | 57.5 | 48.0 |
| |
| NONINTEREST EXPENSE: | | | | | | | | |
| Salaries and employee benefits | | 110.1 | 106.2 | 99.2 | 91.2 | 82.2 | 69.9 | 58.1 |
| Occupancy | 13.0 | 13.2 | 13.4 | 12.9 | 25.4 | 24.0 | 21.6 | 20.6 |
| FDIC insurance expense | | 1.6 | 1.0 | 0.7 | 1.5 | 1.4 | 1.8 | 2.1 |
| Interchange related expense | 4.8 | 5.0 | 4.3 | 4.9 | 4.5 | 4.0 | 4.1 | 3.9 |
| Legal and professional fees | 4.0 | 4.9 | 4.2 | 3.4 | 3.5 | 2.4 | 2.6 | 3.3 |
| Other | | 13.0 | 15.6 | 15.4 | 12.5 | 11.4 | 8.3 | 7.5 |
| Total noninterest expense | 187.3 | 182.3 | 185.5 | 172.2 | 163.9 | 150.8 | 130.1 | 113.3 |
| INCOME TAX EXPENSE | 25.7 | 23.6 | 19.4 | 21.5 | 16.4 | 32.8 | 23.1 | 18.1 |
| NET INCOME | 91.1 | 86.8 | 83.2 | 91.7 | 77.9 | 45.6 | 45.9 | 35.2 |
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| BASIC EARNINGS PER SHARE: | | | | | | | | |
| Basic earnings per share (in dollars per share) | | | | | | | | |
| DILUTED EARNINGS PER SHARE: | | | | | | | | |
| Diluted earnings per share (in dollars per share) | | | | | | | | |